public class e4_19{
  public static void main(String args[]){
    Student zhang = new Student();
   Student geng= new Student();
   zhang.setAge(23);
  System.out.println("zhang的年龄:"+zhang.getAge());
  geng.setAge(25);
  System.out.println("geng的年龄:"+geng.getAge());
}
}
